Jump to main content
Jump to site search

Issue 21, 2018
Previous Article Next Article

Atomic-scale understanding of high thermal stability of the Mo/CoFeB/MgO spin injector for spin-injection in remanence

Author affiliations

Abstract

Remanent spin injection into a spin light emitting diode (spin-LED) at zero magnetic field is a prerequisite for future application of spin optoelectronics. Here, we demonstrate the remanent spin injection into GaAs based LEDs with a thermally stable Mo/CoFeB/MgO spin injector. A systematic study of magnetic properties, polarization-resolved electroluminescence (EL) and atomic-scale interfacial structures has been performed in comparison with the Ta/CoFeB/MgO spin injector. The perpendicular magnetic anisotropy (PMA) of the Mo/CoFeB/MgO injector shows more advanced thermal stability than that of the Ta/CoFeB/MgO injector and robust PMA can be maintained up to 400 °C annealing. The remanent circular polarization (PC) of EL from the Mo capped spin-LED reaches a maximum value of 10% after 300 °C annealing, and even remains at 4% after 400 °C annealing. In contrast, the Ta capped spin-LED almost completely loses the remanent PC under 400 °C annealing. Combined advanced electron microscopy and spectroscopy studies reveal that a large amount of Ta diffuses into the MgO tunneling barrier through the CoFeB layer after 400 °C annealing. However, the diffusion of Mo into CoFeB is limited and never reaches the MgO barrier. These findings afford a comprehensive perspective to use the highly thermally stable Mo/CoFeB/MgO spin injector for efficient electrical spin injection in remanence.

Graphical abstract: Atomic-scale understanding of high thermal stability of the Mo/CoFeB/MgO spin injector for spin-injection in remanence

Back to tab navigation

Supplementary files

Publication details

The article was received on 19 Mar 2018, accepted on 24 Apr 2018 and first published on 24 Apr 2018


Article type: Paper
DOI: 10.1039/C8NR02250J
Citation: Nanoscale, 2018,10, 10213-10220
  •   Request permissions

    Atomic-scale understanding of high thermal stability of the Mo/CoFeB/MgO spin injector for spin-injection in remanence

    B. Tao, P. Barate, X. Devaux, P. Renucci, J. Frougier, A. Djeffal, S. Liang, B. Xu, M. Hehn, H. Jaffrès, J. George, X. Marie, S. Mangin, X. Han, Z. Wang and Y. Lu, Nanoscale, 2018, 10, 10213
    DOI: 10.1039/C8NR02250J

Search articles by author

Spotlight

Advertisements